Gold Foil Cards ARE REALLY GOOD INVESMENT AND HAVE HIGHEST VALUE IN THE MARKET (PH NEWBIE)

All cards are available in a much more scarce Gold Foil variation that offers bonuses when playing and for which fewer cards are required to level up.

Every card has a 2% chance of turning gold just after being revealed.
DEC Bonus
When played in Ranked battles, each Gold Foil card earns the player a 10% DEC bonus upon their victory. This bonus can be stacked, meaning that it can be used on up to 7 cards per battle (1 Summoner and 6 Monsters). So the maximum bonus that can be earned in Ranked battles by using Gold Foil cards is 70% more DEC per win.
Special Tournaments
Some tournaments are designed so that only Gold Foil cards can be played. These Gold Foil tournaments generally have fewer participating players and greater prize pools than regular foil tournaments. In Guild Brawls, there are also always frays that are only playable by Gold Foil cards.
Fewer Cards to Level
Because they are significantly rarer, Gold Foil cards always require fewer BCX to increase levels, no matter the rarity of the card. The exact number of BCX required varies by set; below are examples of each rarity from the Untamed set.

It's really going crazy when this cards are burning in near future. Splinterlands Dev's are really amazing by controlling the amout or stock of this cards so they have a higher value.

DEC Price PREDICTION: post-Quest Potion update
Disclaimer: Everything you will read in this post is but a mere prediction in my part. I CAN BE WRONG. But, I assure you that I did some research regarding this topic. If you have any queries or additional thoughts, feel free to comment below. I believe, this is a good topic to discuss.
Many believe that after the devs updated the quest potion (you can't buy it with credits anymore) the DEC price will skyrocket...
Here are my thoughts...
The intended price for a quest potion is supposedly 1 dollar each. And by paying using credits, we are not actually saving, we are just paying the exact amount that we should pay for every quest potion. But why isn't it worth it to buy quest potion using DEC? Well, DEC's price was originally 1000 DEC for 1 dollar. But, because of the SPS airdrop being implemented for 1 whole year, and people get more airdrop rewards according to the amount of DEC they have in-game, people are hoarding DEC in-game. And this affects the DEC value by a ton.
Here's why... The price of DEC is dependent on the amount of DEC distributed to all players, and if more and more people are hoarding DEC instead burning them, the price of DEC will surely appreciate.
Where is this heading?

• Following the theory I've mentioned above, it is very likely that the value of DEC will go higher... At least until the SPS airdrop ends (because again, people wants more of those daily airdrops). BUT, also expect DEC to go back to its intended price which is for every 1000 DEC = $1 or 1 DEC = 0.001 cents AFTER the SPS Airdrop ends.
  What will happen to the future of the play-to-earn mechanic in Splinterlands?
• Now, before you doubt the game, here's the good news. SPS, if I remember it correctly(Based on the official discord AMA) will become the new DEC next year. Meaning the DEC will be a constant value and the SPS will now be the currency that is volatile and is highly affected by the supply and demand on the market. And the SPS you get from staking will definitely pay out soon.
  Added Thoughts:
• Since the DEC value won't go down any sooner (given that we still have about 11 months till the SPS airdrop ends), feel free to grind more and more DEC in ranked battles. If there's a good time to grind DEC, that would be NOW...
  Alright, I will go back to grinding... God Bless 🙏
  Edit: To answer some few questions:
  Do I think that the price per DEC will increase significantly?
• Reasonably YES. I don't see it going down at least WITHIN the duration of the SPS airdrops.
  What should be our response?
• GRIND. Grind as much DEC as you can in a span of 11 months.

INVEST NOW TO THE CARDS SPLINTERLANDS GOLD FOIL.